Cristallo’s mosaic-like Mona Lisa façade is arguably the most attractive storefront on Rua Oscar Freire. The chocolate-and-pastries shop opened in 1953, and since then, Cristallo has been serving some of the best panettone and paninis in town. Grab a seat outside for an espresso and some people-watching, and try not to leave without trying a chocolate-covered bomba (R$5.20).